Systems of solutions, minerals, and humic substances in soils

The equilibrium composition of solutions, minerals, and humic substances of the humus-clay plasma from the humus horizon of a leached chernozem was calculated using the method of computerized physicochemical simulation based on Gibbs' principle of minimum free energy in the equilibrium state of...

Full description

Saved in:
Bibliographic Details
Published in:Eurasian soil science 2007-12, Vol.40 (12), p.1279-1288
Main Author: Shoba, V N
Format: Article
Language:English
Subjects:
Soils
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The equilibrium composition of solutions, minerals, and humic substances of the humus-clay plasma from the humus horizon of a leached chernozem was calculated using the method of computerized physicochemical simulation based on Gibbs' principle of minimum free energy in the equilibrium state of the system. It was shown that the plasma from the humus horizons of chernozems and soddy-deeply podzolic soil mainly consists of oxides, hydroxides, humic substances, kaolinite, and 2: 1 illite-smectite minerals. The stoichiometry of the humic substances corresponds to calcium-saturated humus acids with appreciable contents of iron and aluminum. The crystallochemical composition of the 2: 1 layered minerals classifies them among ferruginated mixed-layered illite-montmorillonites. Simulation at an increased concentration of carbon dioxide indicated the degradation of the humus-clay plasma in a leached chernozem under extensive soil use, which can be restored by application of potassium at rates 1-to -1.5-fold its removal.[PUBLICATION ABSTRACT]
ISSN:1064-2293
1556-195X
DOI:10.1134/S1064229307120046